Difference between revisions of "Constant"
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Logical truth values | Logical truth values | ||
| − | * | + | * [[False|<syntaxhighlight lang="pascal" enclose="none">false</syntaxhighlight>]] |
| − | * | + | * [[True|<syntaxhighlight lang="pascal" enclose="none">true</syntaxhighlight>]] |
data type limits | data type limits | ||
| − | * | + | * [[Nil|<syntaxhighlight lang="pascal" enclose="none">nil</syntaxhighlight>]]: empty pointer value |
| − | * < | + | * [[maxint|<syntaxhighlight lang="pascal" enclose="none">maxint</syntaxhighlight>]]: largest possible [[Integer|<syntaxhighlight lang="pascal" enclose="none">integer</syntaxhighlight>]] value |
| − | The mathematical value [[Pi|π]] is realized as a function in < | + | The mathematical value [[Pi|π]] is realized as a function in {{Doc|package=RTL|unit=system|identifier=pi|text=<syntaxhighlight lang="pascal" enclose="none">system.pi</syntaxhighlight>}}. |
== see also == | == see also == | ||
| − | * | + | * [[Const|<syntaxhighlight lang="pascal" enclose="none">const</syntaxhighlight>]] |
* [[Constants]] | * [[Constants]] | ||
[[Category:Constants]] | [[Category:Constants]] | ||
[[Category:Pascal]] | [[Category:Pascal]] | ||
Revision as of 18:48, 11 February 2018
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A constant is a variable that does not change, it has a final value.
Constants are defined in the const section of a Free Pascal program. When a symbol is defined as constant, the Free Pascal compiler can often do some optimizations to make the output code faster or smaller.
Some special Free Pascal constants are:
Logical truth values
data type limits
The mathematical value π is realized as a function in system.pi.
